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Related-Party Transactions (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Virginia Electric and Power Company |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Commodity purchases from affiliates |  | $ 196 | $ 170 | $ 733 | $ 519 |
Services provided by affiliates | [1] | 106 | 109 | 338 | 333 |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Services provided to related parties |  | 6 | 5 | 17 | 17 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Commodity purchases from affiliates |  | 1 | 2 | 2 | 4 |
Services provided by affiliates | [2] | 32 | 36 | 98 | 106 |
Services provided to related parties | [3] | 53 | 37 | 166 | 113 |
Other receivables | [4] | 15 |  | 15 |  | $ 12
Customer receivables from related parties |  | 1 |  | 1 |  | 1
Affiliated notes receivable | [5] | 17 |  | 17 |  | 20
Dominion Energy Gas Holdings, LLC | Affiliated Entity |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Services provided to related parties |  | 17 | $ 15 | 51 | $ 51 |
Imbalances receivable from affiliates |  |  |  |  |  | $ 1
Imbalances payable to affiliates | [6] | $ 7 |  | $ 7 |  |
[1] | Includes capitalized expenditures of $34 million and $33 million for the three months ended September 30, 2018 and 2017, respectively, and $109 million and $104 million for the nine months ended September 30, 2018 and 2017, respectively.
[2] | Includes capitalized expenditures of $10 million and $13 million for the three months ended September 30, 2018 and 2017, respectively, and $27 million and $33 million for the nine months ended September 30, 2018 and 2017, respectively.
[3] | Amounts primarily attributable to Atlantic Coast Pipeline, a related-party VIE.
[4] | Represents amounts due from Atlantic Coast Pipeline, a related-party VIE.
[5] | Amounts are presented in other deferred charges and other assets in Dominion Energy Gas’ Consolidated Balance Sheets.
[6] | Amounts are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets.

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